Electric boiler - installation / service / repair. Years (minimum 1,500 hours on-the-job training + 8 weeks at rdc each year). How do i open the drain out bathroom bottle? Finding a leak may seem like finding a needle in a haystack, but it’s worth a shot, before calling a heating tech most all hvac companies charge an hourly rate, which can become quite expensive, if they spend hours troubleshooting your system. Country of origin - united kingdom. A single pipe.